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The shortest time possible to create a vaccine is 12-18 months and we saw the vaccine of Russia being created in less than a year and we all know that it skipped some of the clinical trials. Even though it has promising results in their country, it will not be the same in other countries.
Now regarding the Dengvaxia, I didn't tried to do some research on it but I only know that many people especially children are killed because of it. It can also happen again with the Sputnik V (Russian cure for COVID19) that is why they are doing some trials on it too and possible it will be used by public next year at least.
Now, if the trial of this vaccine will come to your place and ask you to get injected by the vaccine for free would you do it? or not?
I'm not infected with the virus so I will use myself as an experiment tool and inject this vaccine to me.
If it could be proven effective what do you think about the economy of all country which will going to lead now in the economic growth?
One effective vaccine can be a catalyst to the recovery of the economy of the countries. It can make the current economy reverse from down trend to uptrend but still it will take time. It can start for the economy to grow again for sure.